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Significant Accounting Policies (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Significant Accounting Policies (Textual) [Abstract]          
Notes receivable $ 39,409,000   $ 39,409,000   $ 0
Notes receivable interest rate     7.00%    
Note maturity public capital threshold     5,000,000    
Loan amount 26,500,000   26,500,000    
Discount rate on note receivable     6.99%    
Note receivable interest income 506,000   744,000    
Sale of marketable securities       3,500,000  
Gross realized gains       3,100,000  
Gain reclassifed into earnings from other comprehensive income 0 0 0 3,492,000  
Premium on preferred stock redemption or repurchases, net 2,791,000 175,000 2,791,000 175,000  
Net current liability 6,100,000   6,100,000    
Deferred tax asset 22,000,000   22,000,000    
Net of a valuation allowance 1,200,000   1,200,000    
Income tax benefit     22,900,000    
Recognition and evaluation of tax position, whether a tax position is more likely not (greater than 50 percent probability)        
Unrecognized tax benefit, accrued interest or penalties due to examination 0   0    
The tax years remain open to examination by the major taxing jurisdictions 2008 - 2011        
Series G Preferred Stock [Member]
          
Significant Accounting Policies (Textual) [Abstract]          
Preferred stock, shares issued 3,264,362        
Preferred stock, redemption price per share $ 25   $ 25    
Preferred stock, redemption amount 82,100,000   82,100,000    
Note due February 2017 [Member]
          
Significant Accounting Policies (Textual) [Abstract]          
Notes receivable 13,200,000   13,200,000    
Notes receivable interest rate     10.00%    
Note due June 2022 (net of discount of $291) [Member]
          
Significant Accounting Policies (Textual) [Abstract]          
Notes receivable 26,209,000   26,209,000    
Notes receivable interest rate     7.00%    
Note receivable, unamortized discount $ 291,000   $ 291,000